I would like to hear about what people will think he will be like and the exciting places he will take physics, the problems he will have getting recognized.
There is several directions to go in at the moment.
They could resolve the R evolution issue in Quantum Mechanics(the measurement paradox).
Or how General Relativity's block time approach to causality can be reconciled with QM's more conventional one.
As well as several other conceptual questions raised by putting Quantum Field Theory and General Relativity together.
There are also Witten type geniuses. This kind may solve problems like giving Quantum Field Theory a rigorous mathematical foundation, or solving the Navier-Stokes equation.